What is a defining characteristic of heat cramps?

Heat cramps are specifically characterized by painful, involuntary muscle spasms, which often occur during physical exertion in hot environments. These cramps typically affect large muscle groups, such as those in the legs and abdomen, and are a response to loss of electrolytes and dehydration. While other symptoms like nausea, vomiting, or loss of consciousness may arise from more severe heat-related illnesses, they are not defining features of heat cramps. Understanding these symptoms is crucial for recognizing and managing heat-related conditions effectively, ensuring an appropriate response to prevent more serious issues such as heat exhaustion or heat stroke.